UIPageViewController中的边缘点击手势大概是屏幕的1/6，市面的大多数阅读器点击手势都在1/3以上，或者我干脆想自定义点击的范围，但又不想放弃系统的翻页效果，这时候该怎么做了？其实很简单，听我细细说来。
1.首先禁用UIPageViewController的tap手势（如果不禁用，会造成多次翻页）
可以创建UIPageViewController的分类，重写shouldReceiveTouch:方法即可
@implementation UIPageViewController (EnlargeTapRegion)
-(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
return NO;
}
return YES;
}
@end
2.自定义tap手势，实现touchReceiveTouch中的有效点击及响应的点击方法
- (void)tapSelf:(UIGestureRecognizer *)gesture {
NSLog(@"receive tap action !!!");
UIView *touchView = gesture.view;
CGPoint touchPoint = [gesture locationInView:touchView];
CGFloat viewWidth = CGRectGetWidth(touchView.frame);
if (touchPoint.x < viewWidth/3) {
_page -= 2;
UIViewController *preVC = [self previousVC];
BackPageViewController *backVC = [self backVCAt:[self previousVC]];
[self.pageVC setViewControllers:@[preVC,backVC] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
}else if (touchPoint.x > viewWidth/3*2) {
_page += 2;
UIViewController *nextVC = [self nextVC];
BackPageViewController *backVC = [self backVCAt:[self nextVC]];
[self.pageVC setViewControllers:@[nextVC,backVC] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
UIView *touchView = gestureRecognizer.view;
CGPoint touchPoint = [gestureRecognizer locationInView:touchView];
CGFloat viewWidth = CGRectGetWidth(touchView.frame);
if (gestureRecognizer == _weakTap) {
if (touchPoint.x < viewWidth/3 || touchPoint.x > viewWidth/3*2) {
return YES;
}
}
return NO;
}
-shouldReceiveTouch方法中判断当前的触点X是否规定区域内，否则返回NO
-tapSelf方法中根据触点位置判断翻页方向，使用pageViewController的方法setViewController:direction:方法实现手动跳转
注意：使用这种方式跳转，不会常规走pageViewController的代理方法，需要自行处理数据的同步
pageviewController的双面模式实现，仅仅在pageCurl翻页模式下存在
1.设置doubleSide属性为YES
2.viewControllerBeforeViewController:及viewControllerAfterViewController代理方法中根据页面返回相应的控制器
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
_page -= 1;
if (_page % 2 == 1) {
return [self backVCAt:[self previousVC]];
}else {
return [self previousVC];
}
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
_page += 1;
if (_page % 2 == 1) {
return [self backVCAt:[self nextVC]];
}else {
return [self nextVC];
}
}
3.当前视图的左右翻转透明显示
自定义控制器里面添加imageView，外界传入原本控制器或控制器视图，对该视图进行翻转绘制成图片赋给imageView
-(UIImage *)captureWithView:(UIView *)view
{
CGRect rect = view.bounds;
UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
CGAffineTransform transform = CGAffineTransformMake(-1.0, 0.0, 0.0, 1.0, rect.size.width, 0.0);
CGContextConcatCTM(context, transform);
[view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}